This is my fourth and final baby. The other three have been breast-fed for personal reasons I am choosing not to breast-feed this time around in formula feed instead, I have no idea how many 4 ounce bottles I should purchased how long baby will use for ounces or anything of that nature at the moment, I only have three Avent anticolic bottles, but I’m sure I need more than that. Just don’t know how many exactly would love some opinions from mothers, who are more experienced in bottlefeeding.